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<h3 class="heading"><span class="type">Paragraph</span></h3>
<p>As <span class="process-math">\(t \to\infty\text{,}\)</span> solution does not change in time anymore, as it reaches a steady state, say <span class="process-math">\(U(x)\text{.}\)</span> Then</p>
<div class="displaymath process-math" data-contains-math-knowls="">
\begin{equation*}
U_t = 0\quad\to\quad U_{xx}=U_t = 0\quad\to\quad U(x) = Ax + B,
\end{equation*}
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<p class="continuation">where <span class="process-math">\(A\text{,}\)</span> <span class="process-math">\(B\)</span> are determined by boundary conditions.</p>
<span class="incontext"><a href="sec7_8.html#p-421" class="internal">in-context</a></span>
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